.container {
  height: 100vh;
  padding: 16px;
}
.boxs-1 .box .point:first-child {
  background-color: #8fdfae;
}
.boxs-2 .box .point:last-child {
  background-color: #8fdfae;
}
.boxs-3 .box .point:nth-child(1) {
  background-color: #8fdfae;
}
.boxs-4 .box .point:nth-last-child(2) {
  background-color: #8fdfae;
}
.boxs-5 .box .point:nth-child(odd) {
  background-color: #8fdfae;
}
.boxs-6 .box .point:nth-child(even) {
  background-color: #8fdfae;
}
//n 从零开始递增
.boxs-7 .box .point:nth-child(3n) {
  background-color: #8fdfae;
}
.boxs-8 .box .point:nth-child(n+3) {
  background-color: #8fdfae;
}
.boxs-9 .box .point:nth-child(2n + 1) {
  background-color: #8fdfae;
}